<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    .content{
      width:100px;
      height:100px;
      background:red;
    }
  </style>
</head>
<body>
  <div class="content">开始自己的提交</div>
  <div class="box">1234567612345654321234543234543234564567</div>
  小磊
</body>
</html>